Drill grinder



5 K D O R B E L DRILL GRINDER 3 Sheeis-Sheet 2 Filed June 7, 1947 M, 3935i T. E Emol@ 2554,05()

DRILL GRINDER Filed June m 1947 5 sheets-sheet s fare/z for /T/Mmas E ,Eroc/s fatented ug. 14, 1951 DRILL GRINDER Thomas E. Brooks, Clarinda, Iowa, assignor to Lisle Corporation, Clarinda, Iowa, a corporation of Iowa Application June 7, 1947, Serial No. 753,261

(Cl. 51--219l 8 Claims. l

This invention relates to drill grinders, and is adapted to be used with a power or hand driven grinding wheel.

An object of the invention is the provision of means for holding diierent sizes of drills to be ground.

The drills are held in a V-shaped main clamp and when drills of very small diameter are ground it has been found diflicult to secure them tightly in the bottom of the V seat. Another object therefore is the provision of an auxiliary clamp capable of extension more deeply into the V seat of the drill clamp where it :may more effectively seat the drill in the V seat and hold it there against slippage when the drill is brought against the face of the grinding wheel. A further object is the provision of an adjustable means on the V-shaped clamping means for engagement by the drill for preventing the drill from turning. Drills of different sizes t in the V seat of the clamping means at different levels, and the adjustability of the means for preventing turning of the drills can be extended up from and down toward the bottom of the V seat for properly engaging drills of different sizes.

Another object of the invention is to provide reciprocating means for moving the drill in a line parallel to the face of the grinding wheel which line is usually, but not necessarily, parallel to the axis of the grinding wheel, said reciprocating means in conjunction with angle adjusting means making it possible to grind a variety of angles on the cutting faces of drills while moving the cutting face across the face of the grinding wheel. Such movement tends to keep the face of the wheel flat and true and also permits the grinding of large diameter drills by means of grinding wheels thinner than half their diameter. Thus large diameter drills may be accurately ground on a comparatively inexpensive machine having a narrow grinding wheel and with a minimum of wheel dressing.

Still another object of the invention is the provision of a drill grinder of the general type described above, in which the Work holding means can be withdrawn from the remainder of the device and a lwheel dresser inserted for dressing the grinding wheel.

Still another object is the provision of means whereby in any setting of the device for grinding a drill, a wheel dresser can be inserted and moved along the face of the wheel on a line parallel With the face of the wheel, which face is preferably parallel with the axis of the wheel but may be at anangle thereto and yet secure absolute ac- 2 curacy of angle on the drill that is subsequent ly ground, with the same setting of the drill grinder.

The drill grinder is normally positioned for grinding the cutting face of the drill a definite angle (usually 59). In previous devices of this type, when it was desired to dress the grinding wheel before a drill was finished, it was necessary to reset the device so that the wheel dresser could be moved on a line parallel to the axis of the wheel for producing a square face on the grinding wheel. It was often impossible to reset'the device for positioning the drill in its original position. However, in the present device when the drill holding part of the device is to be removed, a Wheel dresser can be inserted and reciprocated across the face of the wheel in the desired direction Without changing the setting of the drill grinder.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my device whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in the claims and illustrated in the accompanying drawings= in which:

Figure 1 is a top view of the device showing a small drill in the work holding clamp in its proper relation to the grinding wheel;

Figure 2 is a View taken on line 2 2 of Figure 1;

Figure 3 is a top view of the work holding portion shown in Figure l, with a portion of the work holding clamp in section, and showing a large size drill in place therein;

Figure 4 is a view taken on line 4-4 of Figure 3 and showing a stop lip adjusted for a large drill;

Figure 4a is a fragmentary similar view showing the stop lip adjusted for a small drill;

Figure 5 is a View taken on line 5 5 of Figure 3;

Figure 6 is a front view of the fixed support of the device showing the drill holding clamp removed, and a wheel dresser inserted therein;

Figure 7 is a view taken on line 1-1 of Figure 6;

Figure 8 is a sectional View taken on line 8-8 of Figure 6;

Figure 9 is a sectional View taken on line 9--9 of Figure 6; and v Figure l0 is a sectional View taken onV line Ill- I0 of Figure 6.

Referring in detail to the drawings, the drill grinder comprises a fixed support, indicated generally at I2, and a drill holder, or work holding unit, indicated generally at I4. The fixed support I2 includes a squared way rod I5 secured to a bracket I8 supported on a work bench or convenient base support. The way rod I8 is provided with a threaded end and a nut I1 for securing to the bracket I8. rIhe device is to be used in connection with a grinding wheel shown in dotdash lines at 20, and is secured to the bench in such a manner that the way rod I6 is disposed parallel to the axis of the grinding wheel 20.

Figures 6 and 7 may be referred to in connection with Figure 1, for a view of the construction of the support I2. The support I2 includes a lower portion 22 in the form of a bracket, having a squared opening 24 therethrough. The opening 24 is adapted for tting over the Way rod I6 and is provided with ears 28 through which bolts 28 are threaded for' tightening the opening 24 the desired extent for having a sliding fit with the way rod. The lower portion of the bracket 22 is provided with an opening 30 disposed below and perpendicular to the opening 24. An adjusting device is secured in the opening 30 in cooperation with the way rod and includes a central bolt 32 having an enlarged hand operated knob 34, at the front of the clamp. A bolt 32 is surrounded by a bushing 36 for tting in the opening 30, and inwardly of the bushing 36 a pinion 38 is secured against rotation to the bolt 32 by means of a key 40. Rearwardly of the pinion 38 is a small bushing 42 fitted in a reduced portion of the opening 80, and outwardly of the bushing 42 a nut 44 is threaded onto the bolt for securing the adjusting device in the opening 30. The way rod I6 is disposed with one corner directed downwardly, and this corner is provided with a series of teeth 4S, forming a rack. The pinion 38 meshes with the teeth 46 and by turning the knob 34, the support I2 can be moved along the way rod I6. The upper end of the bracket 22 is formed with a forwardly extending tubular element 48 having an internal opening 58 (see Figure 8). A sleeve 52 is slidably mounted in the opening 50 and biased outwardly by a spring 53. A threaded stem 54 extends through a centraly opening in the sleeve 52, and threads into a reduced portion 56 in the inner end of the opening 50. A thumb screw 58 is threaded through the housing of the tubular member 48 for securing the sleeve 52 against sliding in the opening 58.

The upper portion of the support I2 includes a bracket or casting 60 in the shape of an L, one end extending downwardly below the top of the bracket 22. The downturned extension of the bracket 60 is formed with an opening 62 (see Figure 9) through which a bolt 64 having an enlarged head 59 extends. This bolt 84 is threaded in an opening 68 in the bracket 22, and the head 6B closes the opening B2. A coiled spring 18 surrounds the bolt 64 and its ends are anchored in the brackets 22 and 68 for biasing the bracket 60 counter-clockwise, as viewed in Figure 7.

Formed on the upper surface of the horizontal leg of the bracket 60 is a circular member 12 having a nished outer periphery for dial markings. The upper portion of the bracket 68, including the disc-shaped portion 'I2 is formed with a vertically extending opening 14 (see Figure 10) for receiving a shank 16 formed on the bottom surface of a second circular element 18. An adjusting screw 80 is threaded into the bracket 68 transversely to the opening 14 for engagement with the stud 15. The circular element 18 is of the same size as the element 12, and has a nished periphery for an indicating mark, which cooperates with the dial markings on the element 12. The element 18 forms the bottom portion of the rotatable clamping head indicated in its entirety by the numeral 82, and including a lower portion 84, and an upper portion 8G. The lower portion 84 is formed integral with the element 18 and the two portions 84 and 86V are secured together by a thumb screw 88 extending through an opening 98 in the upper portion and threaded into a threaded opening 92 in the lower portion. The two portions 84 and 86 have formed in their meeting surfaces V seats 94. Secured in the V seats is a removable sleeve 98 (Figure 1) which may be removed for the insertion of a wheel dressing tool 98. The tool 98 is a square rod although it may be round or any other suitable shape and is provided at its outer end with a diamond point 99 for dressing the grinding wheel 20. The diamond point 99 is secured by a screw |00 in the end of the dressing tool 98.

The drill holding unit |4 comprises a shank |8|, adapted to have a sliding t in the sleeve 98, which is held by the V seats 94 in the rotatable clamping head 82. The end of the shank I 0| adjacent the grinding wheel 20 is formed with an enlarged portion |02 for cooperation with a mating element |03. The enlarged portion |02 and mating element |83 are secured together by a screw |04 fitted in a slot |05 in a lug |05, formed on the enlarged portion |02, and threaded into the mating element |03. A stem |01 on the shank I0| is iitted slidingly in a slot |88 in the element |03. The elements |02 and |03 are provided with dial markings and yan indicator mark (Figures l and 3) impressed in their surfaces for indicating different radii of movement of the drill holding unit I4. Further details of this construction may be observed in Olson et al. Patent 2,356,115

` dated August 22, 1944.

Formed integral With the element |03 is a drill clamp |09 having a V seat ||0 extending at an angle to the shank I 0I. Extending from the rear end of the drill clamp |89 is a squared rod I|2 fitted and secured therein by a press t or by a rivet. A drill of smaller diameter is shown at I I4 (Figure 1) tted in the V seat I l0 with its cutting end extending forwardly out of the V seat in contact with the grinding wheel 20.

A sliding drill guide IIG, having a V-shaped guiding surface may be secured on the rod I I 2 for guiding long size drills (Figure 3). Outwardly of the guide IIS is an end stop ||8 adapted to engage the rear end of the drill II4. The end stop I|8 has a rod |20 extending therefrom, the purpose of which will appear later.

A clamping bracket |22 is secured to the work holding unit I4 by means of a lug |24 having a squared opening for fitting over the squared rod ||2. The opposite end of the clamping bracket |22 is provided with an overhanging portion |26 forming a shallow U shape. On the extremity of the overhanging portion |26, is a slide element |28 secured by means of a bolt |30 extending through a slot |32 in the clamping element 28 and threading into an opening in the overhanging portion |26. The clamping element |28 eX- tends toward the V seat I I0 and at its lower end is provided with a clamp blade |34 adapted to extend into the V seat I 0.

A threaded adjusting bolt |38, having a knurled knob is threaded through an opening in the overturned portion |26, and is provided with a reduced portion |38 fitted through an opening in an overturned portion |40 in the inner end of the clampying element |28. The reduced 'portion |38 is secured therein by means of a cotter key or other suitable means.

Pivoted on one end of the clamp blade |34 is a swinging clamping jaw |42 tapered toward its free end. The tapered free end of the clamping jaw |42 is adapted to extend nearly to the bottom of the V seat Il@ for a small diameter drill and is centered farther forward in the seat to more effectively clamp drills that are shorter than standard due to having been broken.

The forward edge of the clamping element |69 is disposed at an angle to the direction of the V seat III! and more nearly parallel with the face of the grinding wheel 2|). This forward surface of the clamping element |99 is formed with a groove |44. A stop lip |45 is formed with an indented portion shaped to fit the groove |44 and is provided with a slot |48 through which a clamp screw |50 is threaded into an opening in the floor of the groove |44. The screw head |52] is therefore depressed inwardly from the surface of the end of the clamping element |49. The stop lip |45 extendsfrom the side of the groove |44 adjacent the V seat Ilil, and into the confines of the projection of the V seat Ill] as shown at l5! (Figures 4 and 4a). When a drill is placed in the V seat, the edge of one of the cutting lips ||4a thereof is placed in engagement with the stop lip |45 to prevent the drill from turning when clamped and ground while in the V seat IIB. The stop lip |4 is adjustable in the direction of the slot |48 for extending the over-hanging portion |5| thereof up from the floor of the VV seat for large diameter drills, or down toward the floor thereof as in Figure 4a for small diameter drills. The bottom surface of a large diameter drill will be spaced a considerable distance upwardly from the oor of the V seat IIB, and the stop lip |46 must likewise be adjusted upwardly to engage the cutting lip I leid of the drill. When a small size drill is secured in the V seat |||J however, it extends farther into the seat, and the stop lip |46, in order to be below the center of the drill, must be adjusted downwardly as in Figure 4c. This adjustment is also necessary to prevent engagement of the top (left hand edge in Figure 4a) of the stop lip extension |5| with the trailing lip ||4b of the drill.

As shown in Figure l, when a small drill is being ground the clamp blade |34 is adjusted outwardly from the V seat IH) by means of the adjusting bolt |36, the clamping jaw |42 is swung into the V seat and the adjusting bolt |36 is run down. The tip of the pivoted clamping jaw |42 f is adapted to extend deeper into the seat ||0 to engage a drill, than the clamp blade |34.

This construction also provides more room for the fingers of the operator in placing and properly adjusting a small drill in the V seat. Referring to Figure 1 it will be evident that the blade |34 being a considerable distance from the bottom of the `seat provides the intervening space necessary to receive the fingers of the operator in the adjusting operation. For comparison Figure 4 shows the blade |34 which blocks 01T the room in the V seat more so than the jaw |42 in Figure 2.

When a large drill is placed in the seat Il!! as shown in Figure 3, it is held therein by direct engagement of the clamp blade |34, the pivoted clamping jaw |42 being swung back to the upper side thereof. This gives greater clamping power which is required in large sized drills.

The end stop H8, when used with large drills as shown in Figure 3, is turned with the rod away from the drin. when smaller anus are being ground, the end stop IIB is reversed to the position shown in Figure 1, wherein the rod |20 extends toward the drill and directly engages the drill. When a drill which does not extend out of the seat ||0 is being ground, the rod |20 will extend into the seat for engaging the drill and retaining it in position.

The shank ||J| in the work holding unit |4 is freely slidable and rotatable in the sleeve 96. In this manner, the work holding unit I4 can be rotated about the shank |IJ| by manipulating the squared rod ||2. This permits the cutting end of the drill to be brought into engagement with the grinding wheel and permits the drill to engage the face of the grinding wheel at all points thereacross. The axis at which the cutting end of the drill is to be ground is described in the Olson et al. patent mentioned above, and it need not be described in detail here.

The usually accepted angle between the drill being ground and the face of the grinding wheel is 59. Therefore, the V seat |||J is disposed at the same angle so that when drills are being ground at that angle the shank is positioned parallel to the face of the grinding wheel. The dial markings on the elements 12 and 18 indicate the angle between the drill and the grinding wheel,

In order to change the angle of the drill H4, the adjusting screw 8|] is loosened and the clamping head 32 is rotated to the desired angle, as indicated by the dial markings on the elements 12 and '38.

The bracket 6l), and the clamping head 82, are adapted to swing about the bolt 64 as an axis which is aligned parallel with way rod |6. To adjust the bracket 60, the thumb screw 53 is loosened and the adjusting screw 54 is turned in or out; this action swings the bracket 6|! against the operation of the spring 16 which biases the bracket counter-clockwise as viewed in Figure 7. The bracket SB is adjusted to its desired position, with the sleeve 52 following the head of the adjusting screw 54, and the thumb screw 58 is turned in to lock the sleeve 52 in place. The adjusting screw can then be withdrawn and turned in and when it engages the sleeve the operator knows the bracket is in its original setting.

When it is desired to dress the face of the wheel 2li the work holding unit I4 including the sleeve 96 is removed by first loosening the thumb screw 88. The tool dresser may then be inserted inthe V seats 34 and the thumb screw 88 tightened. The diamond point 99 is brought into engagement with the face of the wheel by the adjusting screw 54 which is rst turned out away from the sleeve 52 so the diamond point 99 will not strike the wheel as the hand knob 34 is adjusted. The diamond point can then be adjusted toward the wheel as required to produce a true face on the wheel. This is done by turning the screw 54 inwardly. The hand knob 34 is then rotated whereby the pinion 38 works along the rack formed on the way rod l5 in one direction or the other, working the diamond point across the face of the wheel, first dressing only the high points. The screw 54 is turned inward in small increments to dress lower points until the wheel is fully dressed.

It will be noted that regardless of the angle at which the support |2 is positioned for grinding the drill, the setting need not be altered for dressing the wheel, because in any case the sup- '7 port will inove along the way rod I6, which determines the line along which the wheel 2D will be dressed.

Adjustment of the bracket 6U is also utilized in the case of grinding drills. To bring the cutting end of the drill up to the proper position with respect to the face of the wheel, the adjusting screw 54 is threaded in or out for adjusting the bracket 60. After the proper adjustment of the bracket 60 is accomplished, the locking screw 58 is threaded into engagement with the sleeve 52, locking the sleeve in position, as described above. Setting of the bracket S3 is made to determine the amount to which one cutting face the drill is to be ground, and when the opposite cutting face of the drill is ground, the operator knows the proper setting is reached, when the head of the adjusting screw 54 engages the outer end of the sleeve 52.

While I have shown a particular embodiment ci my invention, it will be understood of course that I do not wish to be limited thereto since many modiicaticns may be made within the scope of the appended claims.

I claim:

1. A drill holder for mounting in conjunction with a grinding wheel, comprising, a work hold ing unit having a seat, said seat having one end adapted to be disposed adjacent the grinding face of said wheel, said end of said seat adjacent the wheel having a groove formed therein, and an adjustable stop lip secured to said end of said seat adjacent the grinding Wheel, said stop lip having an indented portion shaped to extend into said groove, said indented portion having a slot formed therein, screw means extending through said slot and threaded into the iioor of said groove, the head of said screw means being within the confines of said indented portion, said stop lip having a portion within the connes of the projection of said seat, said stop lip being adjustable on said screw means in directions toward and from the floor of said seat.

2. A drill holder for mounting in conjunction with a grinding Wheel, comprising, in combination, a way rod, said way rod being parallel with the peripheral face of said grinding Wheel, said way rod having a series of teeth formed on it thereby forming a rack, a support mounted on said way rod, said support being articulated on an axis parallel with said way rod, the articulated part of said support being swingable on said axis, a pinion in said support cooperable with sai-:l rack, for rotating said pinion for sliding sais. support along said way rod, a rotatable head mounted on the upper end of said support, said head being rotatable on an axis substantially perpe idicular to said way rod, and means for locking said head in adjusted positions of rotation, said head having a seat for holding work.

3. In a drill holder for mounting in conjuncn tion with a grinding wheel, the combination comprising, a way rod, an articulated support on way rod, said support being adjustable along said way rod, the extended part of said support being swingable about the axis of articulation, a rotatable head 'secured on the extended part of sai-:l support, said head being rotatable on an substantially perpendicular to said way rod, inte cooperating dial markings on said clamping head and the extended part of said support, and rfi-.cans for securing said head in adjusted positions oi rotation.

4. A drill holder for mounting in conjunction with a grinding wheel, comprising, in combina- 8 tion, a support, a work holding unit having a seat, said work holding unit having one end adapted to be disposed adjacent the grinding face of the wheel, and a stop lip secured to said end of said work holding unit laterally of said seat, said stop lip having an extension extending into the confines of the projection of said seat, said extension having a rst edge facing toward the open side oi said seat and having an edge of substantial length extending toward the iloor of said seat, said stop lip being adjustable toward and from the door of said seat whereby said rst edge is movable to a position adjacent the door and to a position spaced from the floor toward the open side of the seat.

5. A drill holder for mounting in conjunction with a grinding wheel, comprising, in combination, a support, a work holding unit having a seat, said work holding unit having one end adapted to be disposed adjacent the grinding face of the wheel, and a stop lip secured to said end of said work holding unit laterally of said seat, said stop lip having a portion adjacent the -floor of the seat, said stop lip having a fixed extension at the pertion of the stop lip adjacent the iioor of the seat and extending into the Comines of the projection of said seat, said extension having a first edge .facing toward the open side of said seat and having an edge of substantial length extending toward the ioor of said seat, said stop lip being adjustable toward and from the oor of said seat whereby said iirst edge is movable to a position adjacent the door and to a position spaced from the floor toward the open side oi' the scat.

G. drill holder for mounting in conjunction with a grinding wheel, comprising, in combination, a way rod mounted parallel with the peripheral face of the grinding wheel, an articulated support adjustably mounted on said way rod, a work holding head mounted on the articulated part ol said support, said head being adapted to hold work in position adjacent said face of the grinding wheel, said head being rotatable on said support ior positioning work therein in different angular positions with respect to said face of the grinding wheel, the articulated part of Said Support being movable for moving said head and the work therein toward and from said face of the grinding wheel, there a range of operation extending transversely across said face of the grinding wheel, and adjusting means intcrcooperating between said way rod and support operable ior controllably moving said support along said way rod, whereby work held in any given angular position is moved throughout said range of operation in a. path parallel with said face of the grinding wheel.

'7. A drill holder for mounting in conjunction with a grinding wheel, comprising, in combination, a support, a drill holder movably mounted on said support and including an elongated seat having at least one end open, said seat being adapted for supporting drills of various lengths and diameters and the drills having flutes of cor-- respondingly various sizes and spacings, the drills being positionable with one end extending out said open end of the seat for engagement with a grinding Wheel, a main, relatively large clamp blade adjustable toward and away from said seat and cooperable therewith for holding large drills, said. main clan-ip blade being effective for bridging the gaps between the flutes `in the drills, and an auxiliary clamp blade adjustably mounted on said main clamp blade at a position adjacent said open end of said seat, said auxiliary clamp blade having a clamping surface substantially smaller than the clamping surface oi said main clamp blade, said auxiliary clamp blade being adjustable toward and away from said seat when said main clamp blade is adjusted away from said seat, the small size of said auxiliary clamp blade being effective for enabling the auxiliary clamp blade to be positioned within the projected connes of small drills.

8. A drill holder for mounting in conjunction with a grinding wheel, comprising, in combination, a support, a work holding unit having a seat, said Work holding unit having one end adapted to be disposed adjacent the grinding face of the Wheel, and a stop lip secured to said end of said work holding unit laterally of said seat, said stop lip extending into the connes of the projection of said seat, said stop lip having a first edge disposed Within the contines of the seat and facing toward the open side of said seat and having an edge of substantial length extending toward the oor of said seat, said stop lip being adjustable toward and from the oor of said seat whereby said first edge is movable to a position adjacent the floor and to a position spaced from the floor toward the open side of the seat.

THOMAS E. BROOKS.

10 REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 292,229 Johnson Jan. 22, 1884 497,095 Hall May 9, 1893 542,099 Nichols et al. July 2, 1895 607,306 Walker July 12, 1898 702,885 Ridderkof June 17, 1902 751,198 Paipart Feb. 2, 1904 1,106,692 Wincrantz Aug. 11, 1914 1,109,320 Burner Sept. 1, 1914 1,324,497 De Koning Dec. 9, 1919 1,426,579 Lueck Aug. 22, 1922 1,495,316 Bird et al. May 27, 1924 1,710,647 Probert et a1. Apr. 23, 1929 1,915,247 Holloway et al. June 30, 1933 2,211,393 Travis Aug. 13, 1940 2,313,641 Hoerst Mar. 9, 1943 2,356,175 Olson et al. Aug. 22, 1944 

